OBTAINING DECORATIVE ALKALINE-ACTIVATED CEMENT BY USING SLAGS WITH A HIGH CONTENT OF IRON OXIDE

Abstract

The soft start device is designed to control the process of starting, operation and stopping of electric motors and enables smooth acceleration, smooth stopping, reduction of the starting current of the motor and coordination of the motor torque with the load moment. The article the control system of the triac device of the smooth start of an asynchronous motor with a constant load moment is considered. The control provides a reduction in the starting current and starting torque of the asynchronous motor. The principle of operation and the main technical parameters of the soft start device are described. The method of reducing power losses in power semiconductor elements of the soft start device is considered. The study of electromechanical processes in the soft start device when working with an asynchronous motor was carried out due to simulated computer modeling in the Matlab / Simulink software environment. The results of simulation modeling are given: oscillograms of input currents of the soft start device, dynamics of speed change and starting torque of an asynchronous motor. In the course of the simulation, it was established that the operation of the soft start device allows to reduce the starting current and starting torque by almost half. It is shown that the adjustment of the time to reach the full opening angle of the power switches of the soft start device and the starting angle of the opening of the power switches, which determines the acceleration dynamics of the asynchronous motor, significantly affects the value of the maximum amplitude value of the current and torque. The results of theoretical studies were implemented in a real physical prototype of the soft start device. The image of the boards of the developed soft start device is shown and its technical characteristics are indicated.